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<p>Ammonium carboxymethyl cellulose (CMC–NH<sub>4</sub>) was synthesized through acidification and alkalization of sodium carboxymethyl cellulose (CMC–Na) to address the limitations of conventional lithium-ion battery cathode binders. The resulting CMC-NH<sub>4</sub> exhibited the optimum viscosity in its aqueous solutions and excellent water solubility, which were comprehensively characterized and analysed. The results indicate that the introduction of amino groups has enhanced the water solubility and slightly increased the viscosity of the product. Consequently, CMC–NH<sub>4</sub> is a suitable material for application in Lithium iron phosphate (LFP)-based cathodes. Notably, electrodes fabricated using CMC–NH<sub>4</sub> as a binder demonstrated superior bonding properties and electrochemical performance compared to those employing commercially available Polyvinylidene fluoride (PVdF) binders. Specifically, after 400 cycles at a 1C discharge rate, the LFP-CMC-NH<sub>4</sub> electrode retained 86.6% of its capacity while the LFP-PVdF electrode only maintained 60.7%. These experimental findings suggest that the electrode material maintains its structural integrity after multiple cycles, thereby reducing the blockage or destruction of ion transport channels due to structural changes. Higher capacity retention also means fewer side reactions and slower or thinner formation of the solid electrolyte interface (CEI) film, which helps to maintain the ion transport capacity of the electrode surface. Moreover, the introduction of amino groups improves the affinity between the electrode material and the electrolyte, increasing the ionic conductivity and thus enhancing the overall performance of the battery. Furthermore, CMC-NH<sub>4</sub> exhibits exceptional bonding properties during cycling operations leading to stable long-term cycle performance. This study provides novel insights into binder selection for cathode materials in lithium-ion batteries by highlighting the outstanding performance of CMC-NH<sub>4</sub> as a binder with potential applications in various electrochemical contexts.</p> Graphical abstract <p></p>

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Mechanistic investigation of a novel aqueous binder CMC-NH4 enriched with electronegative elements on the performance of LiFePO4 cathode

  • 期刊论文

  • 发表日期：

    2025年2月27日

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  • Weijie Zheng,
  • Shanbing Zhou,
  • Xinmiao Yang,
  • Peilan Wang,
  • Na Luo,
  • Xuebu Hu,
  • Yongwei Cai,
  • Lei Qiu

摘要

Ammonium carboxymethyl cellulose (CMC–NH4) was synthesized through acidification and alkalization of sodium carboxymethyl cellulose (CMC–Na) to address the limitations of conventional lithium-ion battery cathode binders. The resulting CMC-NH4 exhibited the optimum viscosity in its aqueous solutions and excellent water solubility, which were comprehensively characterized and analysed. The results indicate that the introduction of amino groups has enhanced the water solubility and slightly increased the viscosity of the product. Consequently, CMC–NH4 is a suitable material for application in Lithium iron phosphate (LFP)-based cathodes. Notably, electrodes fabricated using CMC–NH4 as a binder demonstrated superior bonding properties and electrochemical performance compared to those employing commercially available Polyvinylidene fluoride (PVdF) binders. Specifically, after 400 cycles at a 1C discharge rate, the LFP-CMC-NH4 electrode retained 86.6% of its capacity while the LFP-PVdF electrode only maintained 60.7%. These experimental findings suggest that the electrode material maintains its structural integrity after multiple cycles, thereby reducing the blockage or destruction of ion transport channels due to structural changes. Higher capacity retention also means fewer side reactions and slower or thinner formation of the solid electrolyte interface (CEI) film, which helps to maintain the ion transport capacity of the electrode surface. Moreover, the introduction of amino groups improves the affinity between the electrode material and the electrolyte, increasing the ionic conductivity and thus enhancing the overall performance of the battery. Furthermore, CMC-NH4 exhibits exceptional bonding properties during cycling operations leading to stable long-term cycle performance. This study provides novel insights into binder selection for cathode materials in lithium-ion batteries by highlighting the outstanding performance of CMC-NH4 as a binder with potential applications in various electrochemical contexts.

Graphical abstract